I guess to illustrate my point even better, consider this:
Understandable misspellings for traitor:
traiter, traitur, trater, etc.
The last vowel (O) in traitor is a "schwa" which can be A, E, I, O, or U.
Here is the definition of the Schwa:
Schwa is the most common vowel sound in English, a reduced vowel in many unstressed syllables,
* like the 'a' in about /əˈbaʊt/
* like the 'e' in taken /ˈteɪkən/ and the /ðə/ (if before a consonant)
* like the 'i' in pencil /ˈpensəl/
* like the 'o' in eloquent /ˈeləkwənt/
* like the 'u' in circus /ˈsɜː(ɹ)kəs/
* like the 'y' in sibyl /ˈsɪbəl/
So any of those vowels could be used, and it could sound the same!
But to use a completely different WORD... (trader)
Matthew